Milking-machine.



J. L. HULBERT.

MILKING MACHINE.

W/ TNESSES;

ATTORNEYS.

J. L. HULBERT.

MILKING MACHINE.

APPLIOATION FILED 111111130, 1911.

1 ,070, 1 34, Ptented Aug. 12, 1913.

2 SHEETSY'SHEET 2.

ATTORNEY omini-3D srrkrrns ,PATENT ortica.

JOHN L. HLBERT, 0F POUGHKEEPSIE, NE'W YORK, ASSIGNOB T0 THE DE LAVAL SEPARATOR COMPANY, A CORPORATION O'F NEW JERSEY.

MILKING-MACHINE.

To all whom t may concern.'

Be it known that I, JOHN L. HULBERT, a citizen of the United States, residing at Poughkeepsie, county of Dutchess, and State of New York, have invented anew and useful Improvement in' Milking-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My inventlon consists in certain improve? men-ts in milking machines whereby a more efficient result is obtained.

My invention relates to a milking machine which is provided with teat cups each of which contains an inflatable cushion or cushions. By admitting air to and exhausting it from these inflatable cushion or cushions in each cup, a pulsation is produced. These teat cups have a conical extension from their lower end which surrounds the teat, and through which the extracted milk passes.

In my improvement the conical extensions have connecting pipes which extend to a milk receiving chamber having an outlet tube. This milk chamber and its outlet tube are constantly under suction.

The drawing off of the milk by constant vacuum is more eicient than a pulsating action, because it milks more thoroughly, but on the other hand, it produces a drawing upon the teat which is irritating and hurtful.l A pulsation will draw off the milk more quickly and will not draw or swell the teat, as in the case of constant vacuum. The

principle of -my invention is to provide a pulsating action when the flow 1s large, and when it grows smaller and more difficult to draw ofi", to decrease the pulsating action until finally when the iow reaches the smallest point i; c. at or about the end of the milking, it approaches a constant vacuum without any substantial pulsation which results in drawing off all the milk. This results from the arrangement, hereinafter described, where the exhaust from the cushion passes directly or indirectly through the milk receiving chamber under suction. With this arrangement, initially, when the flow ot milk is free, a pulsating action of considerable amplitude is produced, but when the How becomes small and the milk difficult to extract, the vacuum increases and the pulsating amplitude decreases. As will be seen, when treating specifically of the apparatus,

Specication of Letters Patent.

Application led June 30, 1911. Serial No. 686,144.

Patented Aug. 12,1913.

this ei'ect is produced because when the milk flows most freely, the pipe connection to the vacuum is full of milk and the air exhausted from the cushion chamber produces a pulsation of the greatest amplitude. As the ow decreases, the milk in the pipe conneet-ion becomes less and a part of the air is carried toward the vacuum and the pulsations become less, and the vacuum stronger. This continues until the final extraction of the milk, when the extraction is'so diiicult, and the ow so small, that practically all the exhaust air is enabled to go to the vacuum and the action on the teat becomes practically vacuum alone, there being practically no pulsation or a very low pulsation.

In my invention I start the milking initially with a pulsating action of considerable amplitude and low vacuum, and as the milking proceeds, decreasing the pulsating amplitude and increasing the strength of the vacuum. Further, with my improved appaf ratus, the pressure upon the lower-part of the teat is less than the pressure on the upper part. I the pressure in the cushion i. e. the pressure on the upper part of the teat, is not greater than that on the lowerpart, the milk passage in the teat might be closed.

My invention also consists in certain other improvements, which generally speaking, may be stated as follows: Providing a controlling valve initially moved by a diaphragm, and subsequently by air admitted in the movement of the valve by the diaphragm. A milk chamber, an inflatable diaphragm for moving the valve, and admitting pressure to the diaphragm and exhaust-- ing into the milk chamber. -Providing a milk chamber having a tube,'. adapted to convey milk, in connection with the teat cups, which milk chamber is under suction. A plurality of milk cups, each having an iniatable cushion or diaphragm, a single valve controlling the admission of air to all of the said cushions, and allowing the airso ad-4 mitted to exhaust to a milk chambei or to the connections from the cups to the milk chamber, the milk chamber being under suotion.

I will now describe the embodiments of my invention shown in the accompanying drawings, and then point out the invention in the claims.

In the drawings: Figure l is a sectional view of my apparatus embodying my .invention.' Fig. 2 is a cross section on line 272, Fig. l. Fig. 3 is a partial section showing outlet from milk chamber to milk receptacle.

Fig. 4 is a view of another embodimentof my invention principally in central section on the line 4 4, Fig. 6. Fig. 5 is a sectional view of a part of the vform shown in Fig. 4, but taken on the line 5-5, Figs. Gand 8. Fig. 6 is a section on line 6-6, Fig. 5. Fig. 7 is a view of a part of the apparatus of Fig. Ll. Fig. 8 is a section on line 8 8, Fig. 5..`

l 'will first describe the construction shown in Figs. 1 3.

c are the teat cups proper, having the conical extension Z) surrounding the discharge portion of the teat connected with a flexible. pipe c leading to the milk receiving chamber d.

e is the outlet pipe -from the milk receiving chamber which is connected, by means or a pipe 30, with the milk receptacle 31, which, by means of a pipe 32 connected with a vacuum pump (not shown), is constantly under suction tending to produce avacuum or partial' vacuum in the milk receiving chamber, the pipe connection between the conical ends of the teat cups and the milk receiving chamber, and in the conical ends of the teat cups.

Flach teat cup is provided with a lining 25. The space between the lining 25 and the inner wall o1? the cup formsA afcushion chamber, in which is placed an inflatable bag or cushion f.

g' are inlets to the cushion chamber connected by flexible pipes it with the passage z in the valve casing. The valve comprises the valve proper 7' and the hollow valve stem 17e. This valve stem has the slotted p0rtion Z through which a pin m,connected with the valve proper, passes. I

o is an inlet to the valve casing from a source of pressure supply, not shown. This inlet o terminates' in the chamber o.

p are passages leading from the valve casing to the milk receiving chamber.

Q isa passage or port through the wall oit the valve stem and communicating with hollow yportion of the stem.

r Vare passages in the valve proper communicating with the exhaust port c.

t is a passage in the valve proper and u is another passage in said valve proper.

v is an annular chamber in the valve casing in connection with the pressure passage. The piston stem does not make a close iit with the lower portion of the valve casing,

yleaving the constricted passage fw.

a: is the diaphragm chamber having therein the diaphragm y.

.e is a puppet valve, in the lower portion of the diaphragm chamber controlling the portn.

The operation is as follows: 1When the 'valve and valve stem are at their lower poroadmasition, the diaphragm chamber .fr is by passage w, passage t and passage. p in connection with the milk chamber, which being under vacuum, relieves the pressure above the diaphragm, the puppet valve lifts, and

` the air pressure below the diaphragm causes the diaphragm to lift, lifting the hollow valve stem with which it is connected. The stem lifts until the slot and pin connection between it and the valve proper causes the valve to lift also. The lifting of the valve brings passages u and in communication with the source of pressure supply, and passage u in connection with the passages i leading to the teat cup cushion chambers. This admits air under pressure to the cushion chambers of the teat cups and also beneath the valve, causing it to quickly complete its movement to the top. Through the constricted passage lw, pressure is also admitted slowly to the diaphragm chamber above the diaphragm y forcing it down slowly and carrying with it the hollow valve stem rlhis movement is partly resisted by the compression of air below the diaphragm y. During the downward movement of the valve stem le the upper end of the slot Z strikes the pin m at the instant that the port g registers with the passage r. lt then carries the valve proper j with it. When the passage r registers with the port e the compression in the space below the diaphragm y is relieved through the"hollow stem lc, the port g, passage wand port e. A very slight further movement of the valve j covers the groove 'v and cuts off the supply of compressed air, but the expansion of that already in the space above the diaphragm completes the movement of the diaphragm and by the valve stem 7c and pin'fm', i105 carries the valve proper y' to the position where the groove u communicates with passage p. 'llhe air from below the valve y' escapes to the vacuum through passages t and p, the milk chamber al and the passage e. 110 Atmospheric pressure acting on top of the valve y' completes the valve movement and allows the air from cushions f to escape to the milk chamber by way oi: the inlets g, tubes h, passages i, grooves u and passage p. 115 rlhe valve is now in the original position and the cycle of operations is repeated.

The construction shown in Figs. 4 8 differs from that described specifically in the following: l'n the construction of these g- 120 ico ' ures, the exhaust from the cushion chambers of the teat cups is into the conical lower extension of the teat cup instead of into the milk receiving chamber, but this change makes no difference in the principle of operation. Further, the valves for controlling the operation are not precisely the same. I

lwill now describe this construction or the differences between it and the other construction. As in the vconstruction last described, there are `-teat cups a having an upper portion containing an inllatable cushion y and a conical lower portion 'b having a liquid pipe connection "c with a milk receiving chamber d. IThis milk receiving chamber 'Il has a passage e leading 'to the milk receptacle. here zis. a suction constantly 'on 'the passage 'eV from a source of suction (not shown) which tends to create a vacuum or partial vacuum 'in the passage e, the milk receiving chamber d and the teat cup conical llower portion, l). In this construction instead of providing an exhaust `from the inflatable cushion chamber of teat 'cups a to the'milk receiving chamber, I provide an exhaust from said chamber to the` lower vend of the discharge conical 'portion of the teat cup. The valve also is different. 1 will 'now describe these 'points ofdifference. 2 is a chamber having the port 3 controlled 'by the valve 4 and the exhaust port '5. In "this 'chamber is the piston 6 Vconnected to the rod 7. This piston has 'a lslot 8 through which passes a pin connected to the valve proper 18. 9 is vthe pressure inlet leading from source 'of pressure supply, 'not' shown, and terminating in the annular chamber 10. 1'1 is a passage leading from the 'port :12 'to the conical lower portions b ofthe teat cups. 13'is a passage in the valve proper 18. 14 is la passage in the valve proper 18, and 15 is a contracted space between the piston rod and its bushing. 16 are passages in the valve casing, connecting through tube 26 with the cushion chambers ofthe teat cups a.

In-the position show-n in Fig. 4, the pressure supply is connected with the pipe leading to cushion chamberof teat cups, and also ,to top of piston 6. When the pressure is sulhcient on to, of thepiston 6 to move it, it and its rod?? descend. After moving the length of the slot 8 they carry the valve V18 with them. This downward movement is retarded bythe compression of air below piston 6 until passage 17 connects with port 5 and allows the air to escape. The piston then makes a quick downward movement carrying 'the valve 18 past the lap position. The passage 13 connects 16 and 11 (see Fig. 7), and the air in the inflatable cushion chamber exhausts into the conical discharge portions of the teat cups.

The upper portion of chamber 2 above the piston '6 is, through passages 14, 15 and 11, connected .with the conical discharge portion of the teat cup, and, it being under constant suction, the air in said portion of the chamber exhausts therethrough.

lVhen the air above the piston is eX- hausted, the valve is allowed to litt, admitting air through the port 3 and the piston is lifted. Theflirst upward movement of the piston 'is a free movement of the rod 7, which at the end of its free movement, cut-s oil the connection of passages 13 and 14 with. passage -11 and connects the pressure supply with passage 14, which admits air below the valve quickly, lifting the valve by the air, and admits air slowly to the top of 170 piston. Air pressure is also admitted through passage 16 to the cushion chambers.

rfhe admission of air rapidly below the valve and slowly above the piston Aenables,

the valve to be rapidly raised to its ultimate 115 osition while the pressure above the piston is slowly 'accumulating to apoint sufficient to cause the piston -to descend. In 'both the construction of Figs. `1-3 and that of Figs. 4-8, by intermittently exhausting from the 30 cushion chamber to the milk passage from the teat to the milk receptacle, a pressure is intermediately admitted vto this passage.

Consequently the :result initially described in this specification takes place.

Ido not 'herein claim the specific construction shown in Figs. 4-8 as the same forms the subject matter of a separate application for lLetters Patent, filed of even date herewith, Serial No. 636,145.

While 'the-outlet 'from the milk receiving chamber is constantly in communication with a source of suction, and while I haveVAA spoken of the milk-receiving chamber, the conical end of the tcat cup, and the pipe connection c between the latter and the milk- `receiving chamber, as being constantly under suction, I do not mean to imply that this suction is, in all parts of theelements mentioned, effective to maintain continuously a degree of absolute pressure less than atmospheric. In fact, in the operation of the particular embodiment of my invention shownv in lFig. 1,'the pressure in the milk receiving chamber and in the portion of the pipe vc ladjacent thereto will momentarily exceed atmospheric pressureiat each pulsation. This condition, indeed, is perhaps necessary in Aorder to obtain that alternate relatively high vacuum and low vacuum, at the teat cup itself, producing the pulsating `action before described. When, therefore, I use the terni constantly under suction, I mean to de- 'fine that condition which constantly tends to produce a vacuum or partial vacuum and do not intend to restrict the invention to a condition in which that tendency is constant-ly operative to maintain such vacuum or partial vacuum throughout every part of the apparatus through which the milk passes from the teat to the milk recelit-acle The method herein described is not herein claimed, as the same forms the subject matter of Letters vPatent issued to' me October 20, 1912, No. 1,043,013, the .application Jfor which is a division of this case.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is:

Y 1. In a milking machine, in combination,

a teat cup, a passage lor the milk constantly under and in communication with a source of suction, said passage leading from the milk discharge portion of the teat, means to intermittently compress the teat, and means *to intermittently admit pressure fluid, into said milk passage, between the teat discharge and the source of suction, alternately with the compression of the teat.

2. ln a milking machine, in combination, a teat cup having an upper portion containing an inilatable cushion and a lower portio-n adapted to surround the milk discharge portion of the teat, means to admit pressure fluid to the cushionv chamber, and means to admit fluid of a lesser pressure to the lower portion of the teat cup.

3.,ln a milking machine, in combination, a teat cup having an upper portion containing an inflatable cushion and a lower portion adapted to surround the milk discharge portion of the teat, means to alternately admit pressure tluid to the cushion chamber, and fluid of a lesser pressure to the lower portion o the teat cup.y

Il. ln a milking machine, in combination, a teat cup having an upper portion containing an inflatable cushion and a lower portion adapted to surround the milk discharge portion of the teat, means to intermittentlyY and4 alternately admit pressure iuid to the cushion chamber, and lluid of a lesser pressure to the lower portion of the teat cup.

5. ln a milking machine, in combination, a teat cup having an upper portion containing an inflatable cushion and a lower portion adapted to surround the milk discharge portion of the teat, means to intermittently admit pressure fluid to the cushion chamber, and means to intermittently admit fluid of a lesser pressure to the lower portion of the teat cup.

6. ln a milking machine, in combination, a teat cup having an upper portion containing an inflatable cushion and a lower p0rtion adapted to surround the milk discharge portion of the teat, aliquid discharge passage, constantly under suction, from the lower port-ion of the teat cup, means to intermittently admit pressure fluid to said discharge passage between the teat discharge point and the suction.

7. ln a milking machine, in combination, a teat cup haring an upper portion containing a cushion and a lower portion adapted to surround the milk discharge portion of the-teat, and means to intermittently admit pressure to the cushion chamber and exhaust therefrom to the liquid passage between the teat discharge point and the suction.

8. ln a milking machine, in combination, ateat cup, a milk receptacle constantly under and in communication with a source of suction, means to intermittently compress the teat, a constantly open passage for the intera-i milk between the dischar e portion et the teat and the milk receptac e, and means automatically to intermittently admit pressure duid into said milk passage, alternately with the compression ot the teat.

9. In a milking machine, in combination, a teat cup having a portion adapted to surround the discharge portion of a teat, means for intermittently compressing the base of the teat, a milk receiving chamber,.a constantly open passage leading from the teat cup to the milk receiving chamber, a milk receptacle constantly under and in communication with a source of suction, a constantly open passage between the milk receiving chamber and the milk receptacle, and means automatically to intermittently admit pressure duid to. the milk receiving chamber ,al-

ternately with the compression ol the base of the teat.

l0. ln a milking machine, in combination,

a teat cup, means for forcing milk out ot the teat, amilk receptacle constantly under and in communication with a source of suction, a constantly open milk discharge passage between the discharge portion of the teat cup and milk receptacle, and means connecting with said passage between the teat cup and the milk receptacle automatically to produce pulsations in the discharge portion oit the teat cup and to produce during each pulsation the minimum absolutek pressure simultaneously with the forcing of the milk from the teat.

l1. ln a milking machine, in combination, a teat cup having an upper portion containing a cushion and a lower portion adapted to surround the .milk discharge portion of the teat, a liquid discharge passage, constantly under suction, from the lower portion of the teat cup, and means to intermittently admit pressure Huid to said discharge passage.

l2. ln a milking machine, in combination, a teat cup having an upper portion containing a cushion and a lower portion adapted to surround the milk dischar e portion of the teat, and means to intermittently admit pressure to the cushion chamber and exhaust therefrom to the4 liquid passage.

13. In a milking machine, in combination, a teatcup having an upper portion containing a cushion, and a lower portion adapted to surround the discharge port-ion of the teat, a milk receiving chamber constantly under suction, a liquid connection between said lower portion of the teat cup and the receiving chamber, means to intermittently admit pressure to the cushion chamber and exhaust therefrom into the milk receiving chamber.

14. ln a milking machine, in combination, a valve and valve stem, a diaphragm chamber having a port to the atmosphere, a puppet valve'controlling said port, a diaphragm lOl.l

lill

lll

in said chamber connected to said valve stem,y la mi-l-k- -receiv'in-grchamberconstantly under: 'suctiony al 'source of-pressu1re-sup ly,` and por'ts'- and -Ipassages ,.eonnectingmt e da .phragm chamberfsbovethe daphragmand .thefsource-of pressure supply: end ,the .dia; phragmchamberabovethediaphragm and' ,the ,milk -receivingchamber., said passages; and .ports being controlled-.byvthe g valve in,

'its movement..

- 15. `4Inamilling machine, fin combination;

a valve having fa. stem, 4a diaphragm. cham.i -ber having afport tothe atmosphere, pup-l et valvecentrolling 'said'.port, a diaphragmr 15,141 saidchambe'rhconneoted `toflsaidivalveg lstem, a milk: receiving chamber cohstantlyl unde1'.suction,\ a source of=pressurersup ljy.l and-ports-and passages connecting the,v ia-l phragm chamber, l above theidiaphragm, :andi

.the source of f pressure supply',1and,.the.diaphragm chamber, above .the diaphragm, zand; .them-ilk receiving chamber,.said ports. and@ passages vbeing' controlled by the valve in .itsi .mov-ement.. f 1- 25 16. In a milking machine, in combination? a valve .and a hollow 'valve stem,. a diaphragmchamberfhavinga port-to the atsmosphere,..a puppet valve .controlling said:

port, a diaphragm'in said chambelrconnect-i cd'to said .valve stem, a milk receiving cham-i ber constantly under suction; a AscurcerofgI pressure supply; and portsand passages con-j .necting the diaphragm chamber above theE diaphragnnandthe Source ofipres'sure sup- 'ily and the diaphragm chamber above the. ilia Jhragm, and the milk'receiving chamberg;

lsaid ports and passages berlbvelow the` dia liragm' l 17.i In combina ion, a valve` a pressure supply. i

66.," 19. In combination, a valve, a diaphragm being controlled the valve in its movement,.an exhaust, there being a passage through the valve stem'com- 40 munieaeting .with the exhaust in the movement o-f the valve, said hollow valve, stem eommu'ni'cating'with 'thel diaphragm chamdiaphragm' chamber, a diaphragm in'said chambercfor initially moving said valve, a passage from .thesurce of pressure supply, portsaand paslsages-adapted in .the movementfof .the valve toconnect the pressure supply passage with 1 50\ ,the space below the valve and continuezthe lmovement of said valve bysaid pressure.'

18. In combination; a valve, a diaphragm chamber, a :diaphragm in said. chambenfoi initially moving said valve, a passage from fthe source of pressure' supplyfrports. andi passages adapted in the movement of the valve -to connect- `the `pressure supply .pasj sage with the. space below the valve, a, .teat cup having an. iniatable eushion,ports and passages leading'fro'm the cushion chamber of the `teat cup` adapted in the movement of the valve in one ,directionv to connect the "cushion chamber o-f the teat cup With the lchamber, a diaphragm in said chamber for initially molvingvsadvalve, a passage. from the #sourceof pressurespply, ports andipas- .sagesla'dapt'ed in the movementiof thel valve ftosconnectthe .pressure supply passage With the .lower end pfthe valve, a.l teat cuprhaving :an inflatable cushion, ports randpassagcs .leading. .from :the cushionL i chamber of the teatcup', vadalp't-ed in. the movement of the -valvein one direction to connect the cushion tchamberothe teat cup with theV pressure d 1 supply, ailower. extension'of the lteaty cupL surmundingthe discharge portion of the teat, .a-.rliquidlpassageifrom said extension constantly. under suction, ports and 4passages connecting-the. valve casing andthe liquid passages,between. the' suction and the't'eat discharge, the valve in the movement in the otherdireetion connecting the passage tothe 4cushion chamber, and the' passageyconn'ect- Ving-.the valve casing .'andthe liquid d-ischarge. 's f l H120, .In a milking machine, in combination, a valve, a teat cup 'having an inflatable cushion portion, a passage from saidlcushion chamber-tothe valve chamber, an extension l ofnthe teat cup surrounding thedischarge portion. of the teat, -a liquid passage'- from .said-` extension'c'nstantly Iunder suction, a

passage .connecting thevliquidpassage Aand 95 .the valve casing., a Source of pressuresupply, 1 d -a passage in the valve adapted in one posiv.tion of the valve to connect lthe pressure supply and the passage to the cushion chamcushion chamber. passage and passage to the I liquid discharge". 4

H21` In-amihkin'g machine, in combination,

a valve, a teat. cup having an inflat-'able -cushchamber to thevalve chamber, an extension of :the teat cupsurrounding the' discharge .portionbf the teat, a .liquid passagefrom said-extension constantly-under suctionp a the valve casing.,.aJ source of pressureisupply, 1 a: passage adapted'n on'e,'position of the .valveto connectthe pressuresupply and lthe passage to. the cushion chamber, and inanb'er: passage and passage to the liqui'd dis-, eharge;a diaphragm chamber, -adiaphragm insaid chambeneonnected with theI vali/ era :.constricted .passage .to the diaphragm chamin .one position ,of the valve. toconnect the" constrcted .passage with vthe pressure supply and iny other positions .vviththe 'passageto the liquid discharge, afportuinsaidi diav a puppet Avalve .controlling said port.

- `:22.In a'milking machine, in combination, anfalve, a teatcup having an inflatable .cush- .ioniportion, a lpassage. from said cushion ber, -and in`anotherposition toconnect the -ionl portion, a ,passage from lsaid cushion passage. .connecting the vliquid Apassage-.and

gctherposition.to'connect the cushion cham- 115 ber above the diaphragm, :ii-passage adapted phragm chamber below thediaphragm,land 125 .chamber to the valve chamber, an extension below the diaphragm and a l controlling said port.

ot the teat cup surrounding the discharge portion ot the teat, a liquid passage from said extension constantly runder suction, a passage connecting),- the liquid passage and the valve casing, a source of pressure supply, a passage adapted in one position of the valve to connect the pressure supply and the passage to the cushion chamber, and 1n another position to connect the cushion chamber passa e and passage to the liquid discharge, a iaphragm chamber, a diaphragm in said chamber connected with the valve, a constricted passage to the dia-` phragm chamber above the diaphragm, -a passage in the valve, adapted 1n one position to connect the constricted passage with the pressure supply and in other positions with the passage to the liquid discharge, a port in said diaphragm chamber below the diaphragm, and a puppet valve cont-rolling said port, and a passage in t-he valve adapted to connect the pressure supply with the space below the valve.

23. ln a milking machine, in combination, a valve, a teat cup having an inflatable cushion portion, a passage from said cushion chamber to the valve chamber, an extension of the teat cup surrounding the discharge portion of the teat, a liquid passage from said extension constantly under suction, a passage connecting the liquid passage and the'valve casing, a source ot1 pressure supply and an exhaust, a passage adapted in one position ot the valve to connect the pressure supply and the passage tothe cushion chamber, and in another position to connect the cushion chamber passage and passage to the liquid discharge, a diaphragm chamber, a diaphragm in said chamber, a hollow valve stem connected tosaid diaphragm, the hollow portion ont the valve stem communicating with the diaphragm chamber below the diaphragm, a passage from the interior to the exterior of said stem and exhaust passages in the valve communicating with the passage through the valve stem and adapted in one position of the valve and stem to connect the interior of the valve with the exhaust, and a loose connection between said valve proper and valve stem, a constrictedj passage to the diaphragm chamber above the diaphragm, apassage in the valve, adapted in one position to connect the constricted passage with the pressure supply and in other positions with the passage to theliquid discharge, a port in said diaphragm chamber puppet valve 2'4, ln a milking machine, in combination, a valve, a teat cuphaving an inatable cushion portion, a passage from said cushion chamber to the valve chamber, an extension of the teat cup surroundingthe discharge portion of the teat, a liquid passage from said extension constantly -under suction, a

nov/dise passage obnnecting the liquidpassage and the valvel as/ing, a source ot pressure supply and an ex aust, a pass ge adapted in one posit-ion of the valve to connect the pressurey supply and the passage to the cushion chamber, and in another position to connect the cushion chamber passage and passage to the liquid discharge, a diaphragm chamber, a diaphragm insaid chamber, a hollow valve stem connected to said diaphragm, the hollow portion of the valve stem communicating with the diaphragm chamber below the diaphragm, a passage from the interior to the exterior et said stem, and exhaust passages l in the valve communicating 'with the passage through the valve stem adapted in one position of the valve and stem to connect the in-f terior oi' the valve with the exhaust, and a loose connection between said valve proper and valve stem, a constricted passage to the diaphragm chamber above the diaphragm, a passage in the valve, adapted in one position to connect the constricted passage with the pressure supply and in other positions with the passage from the liquid discharge, a port in said diaphragm lchamber below the diaphragm, a vpuppet valve controlling said port, and a passage in the valve adapted to connect the pressuresupply with the space below the valve.

25. ln combination, a valve, a diaphragm chamber, a diaphragm in said chamber for initially moving said valve, a passage from the source el? pressure supply, ports and passages adapted in the movement of the valve to connect the pressure supply passage with the space below thevalve, a teat cup having an inflatable cushion, ports and passages leading from the cushion chamber ot the teat cup to the valve casing, adapted in the movement of the valve in onedrection to connect the cushion chamber of the teat cup with the pressure supply, a lower extension of the teat cup surrounding the discharge portion of the teat, a milk receiving chamber, a pipe leading from the lower extension of said teat cup to said milk chamber, a pipe leading from said milk chamber, said last mentioned pipe being constantly under vacuum, ports and passages connecting the valve casing and the milk chamber. the valve in the mcvementin the other direction connecting the passage to the cushion chamber and the passages connecting the valve casing and the milk chamber.

26. ln a milking machine, in combination, a valve, a teat cup having an indatable cushion portion, a passage from said cushion` chamber to the valve chamber, an extensionV under suction, a passage connecting the milk chamber and the valve casing, a source of valve contiolling said port.

pressure supply, a passage adapted in one position of the valve -to connect.- -tlie=pressnre= cushion chamber passageand passage tothe 'milk chamber.

' 27. In a lmilking machine, in combination, a valve', a teat cup havingan inatable cush- -ion portion, a passage from saidy cushionvvchamber to the valve chamber, an extension of the teat cup surrounding the discharge portion of the teat, a milk receiving chamber having an inlet passage' from the teat cup constantly under suction, a` passage connecting the milk receiving chamber and the valve casing, a source of pressure supply, a passage adapted in one position of the valve to con-I nect the pressure supply and thel passage to the cushion chamber, and in another position to connect the cushion chamber passage and passage to the milk chamber, a diaphragm chamber, a diaphragm in said chamber connected with the valve, a constricted passage to the diaphragm chamber above the diaphragm, a passage adapted in one position' of the valve to connect the constricted passage with the pressure supply and in other positions with the passage to the milk receiving chamber, a port in said diaphragm chamber below the diaphragm, and a puppet 28. ln a milking machine, in combination, a valve, a teat cup having'an inflatable cushion portion, a passage from said cushion chamber to the valve chamber, an extension of the teat cup surrounding the discharge portion of the teat, a milk receiving chamber having an inlet passage from the teat cup extension and an outlet passage therefrom constant-ly under suction, a passage connecting the milk chamber and the valve casing, a source of pressure supply, a passage in the valve adapted in one position of the valve to connect. the pressure* supply and the passage to the cushion chamber, and in another position to connect'the c-ushion chamber passage and passage to the milk chamber, a diaphragm chamber, a diaphragm in said chamber connect-ed with the valve, a constricted passage to the diaphragm chamber above-the diaphragm, a passage adapted in one position of the valve to connect the constricted passage with the pressure' supply and in other positions with the passage to the-liquid discharge, a port in said diaphragm chamber below the diaphragm, a puppet valve controlling said port, and a passage adapted to connect. the pressure supply with the space below the valve.

29. In amilking machine, in combination, a valve, ateat cup having an inflat-able cushion'portion apassage from said cushion chamber xtothe valve chamber, an extension casing,- exhaust, a. 'passage 'adapted in oneposition v of evteat oup'surrounding the discharge port-i n/of tlieteat, afniilk receiving chamfberfhavin-g an inlet, passage from t-he teatv 'cup extension and, an outlet passage there,

from, constantly `under suctio1i,` a L"passage connectgng the milk chamber andthe valve arsource of pressuresupply and an of -the-valve to connectthe=,pressure supply and the passage to the-cushion chlamlierg'and .in` another position. to' connect the-cushion "chamber 'passage -andpassage-to the milk chamben'a'diaphragm chamber, a'diaphragm extension and an outlet passage" therefrom-A in said chamber; a hollow valve stem connected tol =saiddiaphragm," thehollow aportion of the valvev stemV communicating with the-diaphragm chamber below the diaphragm', a lpassage from-theinterior to the exterior of' said stem, fanexhaust-'passage in the valve communlcating with the-passage through the valve stem, and adapted,

in one position of the valve and vstem to connect; the interior ofthe valvewith the exhaust, anda loose connection between said valve proper land valve stem, a constrioted passageto the diaphragm 'chamber above the diaphragm, a passage adapted in one 'position of tlievalve to connect the constricted passage' with the pressure supply andi-in other posit-ions with the passage to the milk receiving chamber, a port in said diaphragm chamber below the diaphragm, and aI puppet valve controlling said port.

80. In a milking machine, in combination, a valve', a teat. cup having an inflatable cushion portion, a passage from said cushion chamber to the valve chamber, an extension kof the teat cup surrounding the discharge portion of the lteat, a. milk chamber having an inlet passage from the teat cup extension and an outlet passage therefrom constantly under suction, a passage connecting the milk chamber and the valve casing, a source ot' pressure supply and an exhaust., a passage adapted in one position of the valve to connect the pressure supply and the passage to the cushion chamber` andv in another position to connect the cushion chamber passage and passage to the milk chamber, a

ldiaphragm chamber, va diaphragm in said chamber, a hollow valve stem connected to said diaphragm, the hollow portion of the valve stem communicating with the diaphragm chamber below the A diaphragm, a passage from the interiorto theexterior of said stem, an exhaust passage in the valve communicating with the passage through the valve stem, and adapted in one position of the valve and stem to` connect the interior of the valve with the exhaust, a loose connection between said valve proper and ,valve stem, a constricted passage to the diaphragm chamber above the diaphragm, a passage adapted in one position of the valve to connect the constricted passage with the pressure supply and in another position with 4the passage to the milking chamber, a ort in said diaphragm chamber below the diaphragm, and a puppet valve controlling said port, and a passage in the valve adapted to connect the pressure supply with the space below the valve.

3l. In a milking machine, in combination, a plurality ofteat cups each having an inlatable cushion, and an extensionsurrounding the discharge portion otr the teat, 'a milk chamber and liquid connection from all the teat cups to said milk chamber, a source of pressure supply, a single valve and passages thereto from the pressure supply, the cushion chambers of the tea-t cups and the milk chamber, the valve in its movement alternately connecting the cushion chambers with the pressure and with the milk chamber, the milk chamber being constantly under suction.

- 32. In a milking machine, in combination, al plurality ot teat cups each having lan inflatable cushion, and an extension surrounding the discharge portion of the teat, a milk chamber and liquid connection from the teat cups to said milk chamber, a source of pressure supply, a single valve and passages 'thereto from the pressure supply, the cus ion chambers of the teat cups and the milk chamber, the valve in its movement alternately connecting the cushion chambers with the pressure and with the milk chamber, dthe milk chamber being constantly under suction, a diaphragm chamber, a diaphragm therein connected with the valve, ports and passages whereby in the movement ot the valve pressure is alternately admitted to and exhausted from the diaphragm chamber above the diaphragm.

33. ln a milking machine, in combination, a plurality of tcatcups each having an inflatable cushion, and an extension surrounding the discharge portion of the teat, a milk chamber and liquid connection from the teat cups to said milk chamber, a source of pressure supply, a single valve -and passages thereto from the pressure supply, the cushion chambers of the teat cups and the milk chamber, the valve in its movement alternately connecting the cushion chambers with the pressure and with .the milk chamber, the milk chamber being constantly under suction, a diaphragm chamber, a diaphragm therein connected with the valve, ports and passages whereby in the movement of the valve pressure is alternately admitted to the dia hragm chamber above the diaphragm an exhausted therefrom to the milk chamber.

34. ln a milking machine, in combination, a, plurality of teatcups each having an inliatable cushion, and an extension surrounding the discharge portion of the teat, a milk chamber and liquid connection from the teat 4:comme sure supply, a single vvalve and passages thereto trom the ressure Supply, the cushion chambers of t e teat cups and the milk chamber, the valve in its movement alternately connecting the cushion chamber with the pressure and with the milk chamber, the milk chamber being constantly under suction, a diaphragm chamber, a-diaphragm therein connected with the valve, ports and `passages whereby in the movementot the exhausted from the diaphragm chamber above the diaphragm, a ort in said diaphragmv chamber below t e diaphragm, a puppet valve controlling said port, an vexhaust and ports and passages adapted in the movement of the valve to connect the diaphragm chamber below the diaphragm with the exhaust. l

35. ln. a milking machine, in combination, a plurality ot teat cups each having an intlatable cushion, and an extension surrounding the discharge portion of the teat, a milk chamber and liquid connection from the teat cups to said milk chamber, a source of pressure supply, a single valve and passages thereto from the pressure supply, the cushion chambers of the teat cups and the milk chamber, the valve in its movement alternately connecting the cushion chamber with the pressure and with the milk chamber, the milk chamber being constantlyunder suction, a diaphragm chamber, a diaphragm therein connected with the valve, ports and constricted passages whereby in the movement of the valve pressure is alternately admitted to and exhausted from the diaphragm chamber above the diaphragm.

36. lln a milking machine, in combination, a plurality of .teat cups each having an inflatable cushion, and an extension surrounding the discharge portion ot the teat, a milk chamber and liquid connection from the teat cups to said milk chamber, a source of pressure supply and an exhaust, asingle `valve and passages thereto from the pressure supply, the cushion chambers of the teat cups and the milk chamber, the valve in its movement -alternately connecting the cushion chambers with the pressure and with the milk chamber, the milk chamber being constantly under suction, a diaphragm chamber, a diaphragm therein connected with the valve, ports and passages whereby in the movement of the valve pressure is alternately admitted to and exhausted from the diaphragm chamber above the diaphragm, and a passage adapted in the movement of the valve to admit pressure below the valve.

37. lln a milking machine, in combination, a plurality of teat cups each having an intlatable cushion, and an extension surrounding the discharge portion of the teat, a milk chamber and liquid connection from the teat cups to said milk chamber, a source et pres-` valve pressure is alternately admitted to andA cups to said milk chamber, a source of pres! the pressure and with the milk chamber, the

milk chamber. being constantly under suction, a diaphragm chamber, a diaphragm therein connected with the valve, ports and passages whereby in the lmovement of the valve pressure is alternately admitted to and exhausted from the diaphragm chamber above the diaphragm, a port in said diaphragm chamber below the diaphragm, a

puppet valve controlling said port, an exhaust and ports and assages adapted in the movement of the va ve to connect the diaphragm chamber below the diaphragm with the exhaust, and a passage adapted in themovement of the valve to admit pressure below the valve.

38. In a milking machine, in combination, a plurality of teat cups each having an inilatable cushion, and an extension surrounding thedischarge portion of the teat, a milk chamber and liquid connection from the teat cups to said milk chamber, a source of pressure supply, a single valve and passages thereto from the pressure supply, the cushion chambers of the teat cups and the milk chamber, the valve in its movement alternately connecting the cushion chambers with the pressure and with the milk chamber, the milk chamber being constantly under suction, a diaphragm chamber, a diaphragm therein connected with the valve, ports and passages whereby in the movement of the valve pressure is alternately admitted to and exhausted from the diaphragm chamber above the diaphragm, the passage from the diaphragm chamber being of less size than that to 4the milk` chamber.

39. In a milking machine, in combination,

a teat cup having an inflatable cushion chamber, and an extension adapted to surround the discharge portion of the teat, a discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber and discharge conduit, the valv in its movement bein adapted alternately to connect the cushion chamber with the pressure supply and with the discharge conduit.

40. In a milking machine, in combination, a teat cup having an inflatable cushion chamber and an extension adapted to sur-` -round the discharge portion of the teat, a discharge conduit from said extension constahtly under suction, a source ofpressure supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber, and

'cushion chamber with the pressure supply discharge conduit, the valve in its movement adapted alternately to connect the and with the discharge conduit, a passage leading from the pressure supply to the space below the valve, theA connection of which is controlled by the valve in its movement.

41. In a milking machine, in combination,

a teat cup lhaving an inflatable cushion chamber, and an extension adapted to surround the discharge portion of the teat, a discharge conduit from said extension constantly under suction, a source -of-pressure supply, a valve, ports and passages leading to the valve from `the pressure supply and from the valve to the cushion chamber and discharge conduit, the 'valve in its movement being adapted alternately to connect the cushion chamber with the ressure supply and with the discharge condhit, a diaphragm chamber a diaphragm in said chamber connected with the valve, a passage lto the diaphragm chamber, above the diaphragm and adapted in the movement of the valve to be connected alternately With the pressure supply and with an exhaust.

42. In a milking machine, in combination,

a teat cup having an inflatable cushion supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber and discharge conduit, the valve in its movement being adapted alternately to connect the cushion chamber with the pressure supply and with the discharge conduit, a diaphragm chamber, a diaphragm in said chamber connected to the valve, a passage to said chamber, -above .the diaphragm and adapted in the movement of the valve to be connected alternately with the pressure supply and with the discharge conduit.

43. In a milking machine, in combmation, a teat cup having an inflat-able cushion chamber and an extension adapted to surround the discharge portion of vthe teat, a discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and passages leading tothe valve from the pressure vsupply and from the valve to the cushion chamber and discharge conduit, the valve in its movement being adapted alternately to connect the cushion chamber with the pressure supply and with the' discharge conduit, a passage leading from the pressure supply 'to the space below the valve, the connection of which is controlled by the valve in its movement, a diaphragm chamber, a diaphragm in said chamber connected to the valve,V a passage to said chamber above the diaround the discharge portion of the teat, a

discharge' conduit from said extension con staxitly under suction, a source of pressure supply, a valve, ports and passages leading' to thevalve from the pressure supply and from the valve to the cushion chamber and 'discharge conduit, the valve in its movement V being adapted alternately to `connect the cushion chamber with the pressure supply and, with the discharge conduit, a passage leading from the pressure Vsupply to the space below the valve, the connection of which is controlled by the valve in its movement, a diaphragm chamber, a diaphragm in said chamber connected to the valve, a pas saige to said chamber above the diaphragm a apted in the movement of the valve to be connected alternately with the pressure sup` ply and with said discharge conduit.

45. In a milking machine,in combination, a teat cu having an inflatable cushion chamber, an an extension adapted to surround the discharge portion of the teat, a-discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber and discharge conduit, the valve in its movement being adapted alternately to connect the cushion chamber with the pressure supply and with the discharge conduit, a diaphragm chamber, a diaphragm in said chamber connected with the valve, a passage to said chamber, above the diaphragm and adapted in the movement of the valve to be connected alternately with the pressure supply and with an exhaust, the passage to the diaphragm chamber being a constricted one.

46. ln a milking machine, in combination, a teat cup having -aneinfiatable cushion chamber and an extension ada ted to surround the discharge portion o they teat, a discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber andl discharge conduit, the valve in its movement being adapted alternately to connect the cushion chamber with the pressure supply and with the discharge conduit, a passage leading from. the pressure-.supply to the space below the valve, the connection of which is controlled by the valve inits movement, a diaphragm chamber, a diaphragm in said chamber connected to the valve, a passa-ge from the space below the valve tol said chamber above .the diaphragm and novara/i adapted/in the movement of the valve to be connected` alternately with'the pressure supply and with an exhaust, the passage tothe diaphragm chamber being of less size than the passages leading to the lower portion of the valve land to the exhaust.

47. In a milking machine, in. combination, a teat cup having an inflatable cushion chamber, and an extensioaadapted to surround the discharge portion of the teat, a discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber and discharge conduit, the valve in its move* ment being adapted alternately to connect the cushion chamber with the pressure supply and with the discharge conduit, a diaphragm chamber,... a diaphragm in said chamber connected to the valve, a passage to said chamber, above the diaphragm adapted in the movement of the valveto be connected alternately with the pressure supply and with an exhaust, means to exhaust pressure from and admit pressure tothe diaphragm chamber below the diaphragm.

48. In a milking machine, in combination, ateat cup having an inflatable cushion chamber, and an extension adapted to surround the discharge portion of the teat, a discharge conduit from said extension constantly under suction, a source of pressure sup ly, a valve, ports and passages leading to t e valve from the pressure supply and from the valve to the cushion chamber and discharge conduit, the valve in its movement being adapted'A alternately to connectv the .cushion chamber with the. pressure supply and with the discharge conduit, al diaphragm chamber, a diaphragm in said chamber connected to the valve, a passage to the chamber, above the diaphragm and adapted in the movement of the valve to be connected alternately with the pressure supply and with an exhaust, means to exhaust'pressure from and admit pressure to the diaphragm chamber below the diaphragm, a valve stem connected to said diaphragm, and a loose connection between said stem and the valve proper.

49. ln-a milking machine, in combination, a teat cup having an inflatable cushion chamber, and an extension ada ted to surround the discharge portion o the teat, a discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and passages leading to the valve from the pressure supply and V,from the valve to the cushion cham er and discharge conduit, the valve in its moveyment being adapted alternately to connect the cushion chamber with .the pressuresupply and with the discharge conduit, a diaphragm chamber, a diaphragm in said chamioa ber, a passage to said chamber, above the' diaphragm and adapted in the movement -of the valve to be connected alternately with the pressure supply and with an exhaust, a valve stem, said stem connected to the diaphragm and having a hollow central portion and a passage through the stemv communicating therewith, and passages 1n connection with an exhaust adapted, 1n the movement of the valve, to be connected with said passage through the stem, thehollo'w portion of the stem opening into the diaphragm chamber belowthediaphragm, there being a. port in the diaphragm chamber lbelow the diaphragm, and a puppetv valve cont-rolling said ort. A

.50. In a milking mac ine, in combination, a teat cup having an iniiatable cushionchamber, and an extension adapted to surroundthe discharge portion of the teat, a discharge conduit from said extension constantly under suction, a source of pressure supply, a valve, ports and Apassages leading to the valve rom the pressuresupplyy and from the valve to the cushion chamber and discharge conduit, the valve in its movementbeing adapted alternately to connect the cushion chamber with the pressure sup ply and with the discharge conduit, a diaphragm chamber, a diaphragm in said chamber connected with the valve, and a passage to said chamber, above the diaphragm adapted in the movement of thevalve to be connected alternately with the pressure supply and with discharge conduit, means to exhaust pressure from and admit pressure to the diaphragm chamber below the dia.- phragm.

51. In a milking machine, in combination, a teat cup having an .inflatable cushion chamber, and an extension adapted to surround the discharge portion of the teat, a discharge conduit from said extension constantly under suction, a\ source ot' 'pressure supply, a valve, ports and passages leading to the valve from the pressure supply and from the valve to the cushion chamber and discharge conduit, the valve in its movement being adaptedalternately to connect the cushion chamber with the pressure supply and with the discharge conduit, a dia' phragm chamber, a diaphragm in said chamber, a passage to said chamber, above the; diaphragm adapted in the `movement of the valve tobe connected alternately with the pressure supply and with the discharge vcoriduit, means to exhaust pressure from and admit pressure to the diaphragm chamber 'below the diaphragm, a valve stem connected to said diaphragm and a loose connection between said stem and the valve proper. i

52. In a milking machine, in combination, a teat cup having an inflatable cushion chamber, and an extension ada ted to surround the discharge portion o the teat, a

discharge conduit yfrom 'said extension -constantly under suction,` a source of pressure supply, a valve, orts .and ypassages lleading to the valve rom the `pres'sl'lre sup 1y and from the valve to the kcushion :chamber and discharge conduit, the valve in its movement being-adapted alternately to connect the cushion chamber with vthe pressure supply and with the discharge conduit a diaphragm chamber, a diaphragm in said chamber, a passage to said chamber, above the diaphragm adapted in the movement of the valve, to be connected alternately with the pressure supply and withthe discharge conduit, a valve stem connected to said diaphragm, and loose connection between said stem and the valve proper, said stem having a hollow central portion, and a passage through the stem communicating therewith, and passages in connection with an exhaust adapted, in the movement of the valve, to

be connected with said passage through the a milk discharge passage, means to connect f 54. In a milking machine, in combination,

. the milk discharge passage with the discharge portion of theteat, said passage being constantlyunder suction, and means to produce pulsations directly as, and tending to vary the suction in said discharge passage inversely as the flow of the milk.

55. In a milking machine, in combination, a milk discharge passage, means to connect the milk discharge passage with the discharge portion of the teat, said passage being constantly under suction, and means to produce pulsations inv said discharge passage, varying in amplitude directly as the 'filowof the milk, and varying the suction inversely as said ow of the milk.

56. In a milking machine, in combination, a milk discharge pipe, means to connect the milk discharge pipe with the discharge por- 'tion of the teat, said discharge pipe being constantly under suction, and means exterior -to but connected with said discharge pipe and .teat connecting means tending to vary the suction inversely as the flow of the milk. 57. In a milking machine, in combination, a teat cup; a free and unobstructed discharge from the teat cup comprising a milk chamber, a pipe connecting the teat cup and milk chamber and an outlet pipe -from the ing constantly -in communication with a source of suction; and means communicating with the milk chamber for producing pulsations in the milk discharge. 58. Ina milking machine, in combination, a free and unobstructed milk discharge passage, means to connect the milk dischar e passage with the discharge portion of t e teat, said passage `being constantly under suction, and means to produce pulsations in said discharge passage, the amplitude of which are directly as the-flow of the milk.v

59. In a milking machine, in combination, a free and unobstructed milk discharge passage, means to connect-the milk discharge t e passagewith the discharge portion of teat, said passage being constantly under suction', and means to producefpulsations directly as, and tending to vary the suction in said-discharge passage inversely as the flow of the milk.

' 60. In a milking machine, in combination, a free and unobstructed milk discharge pas'- sage, means to connect the milk discharge passage with the discharge portion of the teat, said passage being constantly under suction, and means to produce pulsations in Ysaid discharge passage, varying in amplitude directly as the low of the milk, and'variyl'ing the suction inversely as said flow of t e milk.

61. In a milking machine, in combination, al milk discharge pipe and means to connect the same with the discharge portion of the teat, said discharge being free and unrestricted and being constantly under suction, and means exterior to but connected with said discharge pipe and teat connecting means tending to vary the suction inversely as the flow of the milk.

62. In a milking machine, in combination, a teat cup, a milk discharge from said teat cup constantly under and in communicationv with a source of suction, and means independent of the suction and automatically to produce pulsations in said discharge.

63. In a milking machine, in combination, a teat cup, a .milk discharge from said teat cup constantly under suction, means to produce pulsations in said. discharge, the amplitude of which are directly as the flow of the milk.

Lorena/a 6ft. ln a milking machine, in combination, a teat cup, .a milk discharge from said teat cup constantly under suction, and means to produce pulsations directly as, and'tending to vary 'the suction in said discharge inversely as the iow of the-milk.

v65. In a milking machine, in combination, a teat cup, a milk discharge from said teat cup constantly under suction, means to produce4 pulsations in said discharge varying in amplitude directly as the How of the milk Aand. varying the suction inversely as said How of the milk. i

66. In a milking machine, in combination, ateat cup,:a milk discharge from said teat cup constantly under suction, and means exterior to the teat cup tendin to vary the suction inversely as the ow o the milk.

67. In a milking machine, in combination, 'la teat cup, a cushion therein, a portion of said cup'adapted to surround thedischarge of the teat, a milk discharge passage from said last mentioned portion, said passage being constantly under suction, means to produce pulsations in said discharge passage, ports and passages for admitting pressure lluid to and discharging from the cushion, a valve controlling lsaid ports and passages, a connection between `said valve and the milk discharge passage for controlling the movement of said valve in one direction. I68. In a milkin machine, in combination, a teat cup, a cus ion therein, a portion of said cup adapted to surround the discharge portion of the teat, a milk discharge passage from said last mentioned'portion, said passage being constantly under suction, means to produce pulsations in said discharge passage, ports and passagesf'or admitting air to and discharging from the cushion, a valve controlling sai ports and passages, .a diaphragm for operating said valve, and a connection between the diaphragm chamber and the milk discharge passage for controlling the movement of the valve in one direction.

In testimony ot Which invention, I have hereunto set m this 28th day o June, 1911.

YJHN L. HULBERT. Witnesses:

M. M. HAMILTON, lEl. E.. WALL.

hand, at Philadelphia, on l 

